I picked up the phone and was asked for my name, as soon as I said there are two people by that name he hung up. I did a redial and the company name is IBEX Global, a call centre for a number of companies. They will allow you to have your phone number added to their do not call list and they say it will take around 72 hours to take effect.
There are comments about this number dating back to 2013. I have been getting a call every few days for the past few weeks. There is no message just dead silence.